Some string changes as suggested by UI leads:
Some string changes as suggested by UI leads:

Removed periods from error page headings
check/uncheck -> select/deselect
internet -> Internet

BUG=61144
TEST=manual

Review URL: http://codereview.chromium.org/5009004

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@66511 0039d316-1c4b-4281-b951-d872f2087c98

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